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<Title>Circular Zones</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Circular Zones</p>
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<img src="images/polarzones.png" width='400' height='420'>
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This example demonstrates adding circular zones to a polar chart.<br><br>
In ChartDirector, a zone defined on the radial axis will mark a radius range, and so will appear as ring on a polar chart.<br><br>
This example contains three circular zones in the plot area background, colored as red, green and blue. The blue region is the original background of the plot area, while the red and green regions are added using <a href="Axis.addZone.htm">Axis.addZone</a> of the radial axis object.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/polarzones.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the chart
double[] data = {51, 15, 51, 40, 17, 87, 94, 21, 35, 88, 50, 60};

// The labels for the chart
String[] labels = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov",
    "Dec"};

// Create a PolarChart object of size 400 x 420 pixels
PolarChart c = new PolarChart(400, 420);

// Set background color to a pale grey f0f0f0, with a black border and 1 pixel 3D border effect
c.setBackground(0xf0f0f0, 0x000000, 1);

// Add a title to the chart using 16pt Arial Bold Italic font. The title text is white (0xffffff) on
// a dark blue (000040) background
c.addTitle("Chemical Concentration", "Arial Bold Italic", 16, 0xffffff).setBackground(0x000040);

// Set center of plot area at (200, 240) with radius 145 pixels. Set background color to blue
// (9999ff)
c.setPlotArea(200, 240, 145, 0x9999ff);

// Color the region between radius = 40 to 80 as green (99ff99)
c.radialAxis().addZone(40, 80, 0x99ff99);

// Color the region with radius &gt; 80 as red (ff9999)
c.radialAxis().addZone(80, 999, 0xff9999);

// Set the grid style to circular grid
c.setGridStyle(false);

// Set the radial axis label format
c.radialAxis().setLabelFormat("{value} ppm");

// Use semi-transparent (40ffffff) label background so as not to block the data
c.radialAxis().setLabelStyle().setBackground(0x40ffffff, 0x40000000);

// Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black border.
LegendBox legendBox = c.addLegend(200, 30, false, "Arial Bold", 9);
legendBox.setAlignment(Chart.TopCenter);

// Add legend keys to represent the red/green/blue zones
legendBox.addKey("Under-Absorp", 0x9999ff);
legendBox.addKey("Normal", 0x99ff99);
legendBox.addKey("Over-Absorp", 0xff9999);

// Add a blue (000080) spline line layer with line width set to 3 pixels and using yellow (ffff00)
// circles to represent the data points
PolarSplineLineLayer layer = c.addSplineLineLayer(data, 0x000080);
layer.setLineWidth(3);
layer.setDataSymbol(Chart.CircleShape, 11, 0xffff00);

// Set the labels to the angular axis as spokes.
c.angularAxis().setLabels(labels);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart.
viewer.setImageMap(layer.getHTMLImageMap("", "", "title='Concentration on {label}: {value} ppm'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Circular Zones&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Circular Zones
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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